A family member says the owner of a sign-making business in Minneapolis was among four people who died when a gunman opened fire at his office.

Chad Blumenfield said Reuven Rahamim was shot to death Thursday at Accent Signage Systems Inc. Rahamim was Blumenfield's father-in-law.

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In a Friday statement to The Associated Press, Blumenfield says other employees died, but he provided no details.

Police spokesman Sgt. Stephen McCarty said the gunman killed four people and injured four more, three men critically, before turning the gun on himself. Police have not released the gunman's identity or motive.

Dozens of police squad cars and SWAT officers swarmed the residential neighborhood on the city's north side after an employee called 911 around 4:30 p.m. to say shots had been fired.